Mareil-sur-Loir

{{Infobox French commune

|name = Mareil-sur-Loir

|commune status = Commune

|image = Vue de Mareil.JPG

|caption = A general view of Mareil-sur-Loir

|image coat of arms = Blason ville fr Mareil-sur-Loir (Sarthe).svg

|arrondissement = La Flèche

|canton = La Flèche

|INSEE = 72185

|postal code = 72200

|mayor = Jérôme Prémartin{{cite web|title=Répertoire national des élus: les maires|url=https://www.data.gouv.fr/fr/datasets/r/2876a346-d50c-4911-934e-19ee07b0e503|website=data.gouv.fr, Plateforme ouverte des données publiques françaises|date=2 December 2020|language=fr}}

|term = 2020–2026

|intercommunality = Pays Fléchois

|coordinates = {{coord|47.715|0.012|format=dms|display=inline,title}}

|elevation min m = 28

|elevation max m = 102

|area km2 = 12

|population = {{France metadata Wikidata|population_total}}

|population date = {{France metadata Wikidata|population_as_of}}

|population footnotes = {{France metadata Wikidata|population_footnotes}}

|demonym = Mareillais, Mareillaise

|website =

}}

Mareil-sur-Loir ({{IPA|fr|maʁɛj syʁ lwaʁ}}, literally Mareil on Loir) is a commune in the Sarthe department in the region of Pays de la Loire in north-western France.